The Frog Who Croaked

From the Files of the Platypus Police Squad. Case #1138. Detectives of record: Rick Zengo and Corey O'Malley. Case brief: A local schoolteacher is missing, and the only thing fishier than the circumstances surrounding his disappearance is the smell coming from the bag he left behind. All clues point to billionaire businessman Frank Pandini Jr. - but why would Pandini get his paws into the illegal fish trade?